Stay-bolt structure.



J. R. FLANNERY.

STAY BOLT STRUCTURE.

on FILED rE 1 APPLICATI B. 9,1916.

lmi. Patentedmlg?, 1918` unirsi) sra'rns rarnnr onirica JOHN ROGERS FLANNERY, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO FLANNERY BOLT COMPANY, OF PITTSBURGH, PENNSYLVANA.

STAY-BOLT STRUCTURE.

Specification of Letters Iatent. Patntgfl Aug, 27, lglg Application led February 19, 1916. Serial No. 79,391.

yhereby declare the following to be a full,

clear, and exact description of the invention,

'such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates t0 an improvement in staybolt structures.

Sonie stay bolts have a tell tale hole or bore extending throughout the length of the y bolt and open at both ends. In others the hole extends from each headpart Way only, through the bolt. Willen a bolt breaks or is fractured, the steam passes through the tell tale and indicates to the fireman that the bolt has been injured. These tell tale holes being open at the ends, form pockets in which the dust and cinders accumulate and clog thus necessitating a cleaning out of the holes at intervals, at times quite frequently and this invention consists in sealing the ends of the holes thus preventing the entrance and accumulation of dust and other matter in the holes, but permitting of the forcible ejection or removal of the seals in the event the bolt should be broken or ruptured, so that the steam or Water as the case may be, will have free egress through the head or end of the bolt.

The invention further consists in a staybolt for boilers having inclosed therein a material which is sensitive to the action of Water to denote the condition of the bolt.

The invention further consists in certain ,features of construction and combinations of parts as hereinafter set forth and pointed out in the claims.

In the accompanying drawings, Figures l, 2, 3 and 4L are views in elevation partly in section of several embodiments of my in- Vention.

In Fig. l I have shown an ordinary rigid stay bolt 5 with a tell tale hole 6 at each end and in Fig. 2 show the tell tale extending throughout the length 0f the bolt.

The holes are closed or sea-led at their outer ends by plugs as at 7 made of metal or packing of any kind that Will not be burned out by the tire or heat; which will prevent the entrance of dust or cinders to the holes and insure the composition in the holes being kept dry.

The composition represented posed of ingredients such as caustic alkali. metallic sodium, etc., which when moist l ed with vvater Will rapidly generate a gas.

which expanding, forces out the seals ork plugs, and which acting on certain tals. such as aluminum and Babbitt nu (or u'hich the closures of the tell-tale hole may be inadehv'ill instantly break down or disintegrate them thus opening up the tell taley holes for the Water.

if therefore a.bolt constructed as above should fracture, the steam or water ns the case may be. coming in Contact with the composition `in the tell tale hole, instantaneously generates a gas which expands and forces out the seals at the ends of the holes, the expan sion of the gasbeing more rapid than could be taken care of by a back low of the gas through the crack caused by the fracture, or as stated above instantly disintegrates or dislodges the seals. As soon as the seals are blown of or out or otherwise dislodged by the reaction Within the bolt, the steam or Water as the case may be, Will be free to flow out through one or both ends of the bolt and indicate to the reman or engineer thaat the bolt is fractured.

When the improvement is applied on a flexible stay bolt as in Fig. 3, I provide the cap 9 of the bolt `with a central opening closed by a soft metal closure l0 which can be readily dislodged by a blow from the inside, and instead of closing the hole With a seal, as in the previous figures, I prefer to employ a loose fitting plunger 1l of hard metal inserted Within the hole a distance sufficient to leave a space for a packing 12, which may be a hard grease. The hole behind the plunger is filled With the composition as in the previously described devices. The construction shown in F ig. d is the same as in F ig. 3 except that the plunger is provided with a pin 13 for more readily dislocating or breaking the soft metal closure for t-he opening in the cap. 1`."Vith these constructions shown in Figs. 3 and el, it Will be seen that when the composition is moistened by steam or Water entering the tellfrce passage of the steam or 5', is comtele hole through :L crook in the boltY the plonger will he olfeilil)v ejected ngninet the :sott inetnl Closure :nid dislodged or rupture the Same und allow of the treeeeeape ot steznn or Water and thus indicate a fracture ot the holt.

l would here it understood 'that ln' the terni "l dielodge eed in the olonne, l lntend to inelnde not only the forcible reino 'nl the ,seals lint also their diintegrntlon.

l would oleo nnte it understood that l do not @online myself to details? but. on the Contrzn';Y Chinn lnoaL lli'v n tell tule hole Carrying i eonrpositioi nnieh on exposure to stenin or Water will Set up n reaction that Will tree the Composition `nid permit it to escupe thus opening np the tell tale to the tree pass-tige ot' stetnn or Writer.

Ity will be apparent that the nniterinl einplojfed within the tell-tale hole will he sneh is Shall he sensitive to the action ot nnter or steznn to denote the condition o'l' the hole.

Haring t'ull;v deerrihed my inrention what l elniin as non' und desire to secure ln' liet,- ters-ljatent, ix:-

l. t stay bolt for boilers herring in therein, n nniterinl which is sensitive notion of water to denote the condition o the holt.

' 2. A stuff holt haring n tell-tule hole. und

sution of Water to denote the 'condition ot the holt.

I5. il stay bolt for boilers having n tell tele hole therein7 A l covering' the outer end ot said hole und n Composition Within the holel` which when exposed to Water or #tieni entering the hole through z Vfracture reaction Vllleielrt to Stil in the holt will eet np flhlodge the seal.

l-. le stay bolt for boilers having tule opening, n ine eal forming n for said opening. und innterinl Within s tellle opening' rhieh will 'nnen exposet moisture, Set up reactions which Will hre-eli donn or disintserate sind inet-nl Cloenre.

5. ln n stny holt structure, n Stay belt having n telltale opening, n bearing for the head ont said holti und n. en@ over the head of the holt, said en) haring en opening, n nre rlofnre tor the oiliening in the empi. nndnn rinl in seid tell-tale tellclosure Qld opening' which Wi y when exposed to moisture, Sety up reziotioiis which result in the lirealiing down, or d.is integrating of Sand closure in the opening in the ez nl ln tetiinon;Y Whereol l have Signed thi@l ,sgeeiliention in the presence of tno enhsorihing witnesses.

JOEE? RUGEBS FLA Witnesses FATIMA' l. lnn'x S.

Bonos, Riten,

may ne obtained for live cents each. by addressing the Commissioner of atents Washngton, E. 

